Requirements

• Xcode 10.2
• Swift 5

Frameworks

Framework	Usage	Detail
RxSwift	Swift version of Rx
RealmSwift RxRealm	Mobile database	1. Easy set up 2. Better support Rx 3. Cross platform support(Such as Android) 4. Faster performance 5. Easy encrpytion 6. Free 7. No limit to data storing
KeychainAccess	Swift wrapper for Keychain	Use for saving database encryption key
Swinject SwinjectStoryboard	Lightweight Dependency Injection (DI) framework for Swift.	Implements Inversion of Control (IoC) for resolving dependencies. Swinject helps your app split into loosely-coupled components, which can be developed, tested and maintained more easily.
SDWebImage	Async image downloader with cache support

Code Structure

Model-View-ViewModel (MVVM) Design Pattern

Model

Feed, User are models used in UI layer.

FeedRM, UserRM are realm object, which are strictly used in database layer.

ViewModel

Contains series of observables, which are ready to display, or only need simple compute logic.

Send request to service layer, but not process heavy business logic.

Controller and View

Layout views if necessary, bind to display series of observables. Should not contains any business logic.

Interactor

Process specific business rule(or single user case)

Adapter

Wrapper classes for realm or keychain, which can be reused.

Others

• Use storyboard Auto Layout, reduce code lines
• Use Collection View, which is more powerful and flexible than table view

Mock Server

Protocols	Methods	Details
MockTokenService	getToken()	Mock server to generate token
MockServerService	signUp() signIn() getFeeds() postFeed()	getFeeds(): Every company has specific policy to query newest info(such as by created time), in this mock we will query by id

Test

Unit Tests

24 tests

UI Tests

1 test

Integration

Jenkins and Fastlane